新概念3第1课、第三课的疑问Lesson1Paw prints were seen in anumber of places and puma fur was found clinging to bushes.Several people complained of 'cat-like noises' at night and abusinessman on a fishing trip saw the puma up a tree.The exp

新概念3第1课、第三课的疑问Lesson1Paw prints were seen in anumber of places and puma fur was found clinging to bushes.Several people complained of 'cat-like noises' at night and abusinessman on a fishing trip saw the puma up a tree.The exp
新概念3第1课、第三课的疑问
Lesson1
Paw prints were seen in anumber of places and puma fur was found clinging to bushes.Several people complained of 'cat-like noises' at night and abusinessman on a fishing trip saw the puma up a tree.The experts were nowfully convinced that the animal was a puma,but where had it come from?(疑问：这里为什么不用where did it come from?必须用had吗?有什么区别?) As no pumas had beenreported missing from any zoo in the country,this one must have been in thepossession of a private collector and somehow managed to escape.
Lesson3
Some time ago,andinteresting discovery was made by archaeologists on the Aegean island of Kea.An American team explored a templewhich stands in an ancient city on the promontory of Ayia Irini.The city atone time must have been prosperous,for it enjoyed a high level ofcivilization.Houses -- often three storeys high(这里often three storeys 是指房子一般有3层,还是指房子很高,一层楼像平常的三层楼一样高?) -- were built of stone.

新概念3第1课、第三课的疑问Lesson1Paw prints were seen in anumber of places and puma fur was found clinging to bushes.Several people complained of 'cat-like noises' at night and abusinessman on a fishing trip saw the puma up a tree.The exp
第一课那是个过去完成时,描述在过去的过去发生的事情.美洲豹来在前,人们发现它在后,所以而人们发现它对我们读者来说又是过去的时间,所以这就算是一个过去的过去.而且,完成时强调的是影响,一般过去式强调的仅仅是过去发生过某个事情.这里很显然强调对当时的影响.第三课指的是房子有三层.

1 这里为什么不用where did it come from?必须用had吗？有什么区别？
根据文章的语境，发现认定该动物是puma是在过去，puma的出现在认定之前，应当用过去完成时
如果是疑问句，就得用had提问。
where did it come from?是一般过去时，不符合文章的语境。
2 often three storeys high意...

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1 这里为什么不用where did it come from?必须用had吗？有什么区别？
根据文章的语境，发现认定该动物是puma是在过去，puma的出现在认定之前，应当用过去完成时
如果是疑问句，就得用had提问。
where did it come from?是一般过去时，不符合文章的语境。
2 often three storeys high意思房子一般为三层
愚见，供参考。

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lesson1 是因为come from 在were seen过去，而were seen是过去发生的，所以come from是过去的过去，用过去完成时。
lesson3 是指这些房子都是三层的。